/**
 * Copyright (C) 2006 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.inject.internal;

import static com.google.common.base.Preconditions.checkNotNull;

import com.google.inject.Provider;
import com.google.inject.spi.Dependency;

/**
 * @author crazybob@google.com (Bob Lee)
*/
final class InternalFactoryToProviderAdapter<T> implements InternalFactory<T> {

    private final Provider<? extends T> provider;
    private final Object source;

    public InternalFactoryToProviderAdapter(Provider<? extends T> provider, Object source) {
        this.provider = checkNotNull(provider, "provider");
        this.source = checkNotNull(source, "source");
    }

    public T get(Errors errors, InternalContext context, Dependency<?> dependency, boolean linked) throws ErrorsException {
        // TODO(sameb): Does this need to push state into the context?
        try {
            return errors.checkForNull(provider.get(), source, dependency);
        } catch (RuntimeException userException) {
            throw errors.withSource(source).errorInProvider(userException).toException();
        }
    }

    @Override
    public String toString() {
        return provider.toString();
    }
}
